1 inch per second (in/s) = 2.54E-05 kilometer per second (km/s).
Inch Per Second (in/s) is a unit of Speed used in Standard system.
Kilometer Per Second (km/s) is a unit of Speed used in Metric system.
Inch per second also can be marked as ips. Kilometers per second also can be marked as km/s and kilometres per second(alternative British English spelling in UK).